Description: This is a circular progress bar based on pure CSS3, and from the outside, this progress bar has a 3D feel, especially on the progress bar has a three-dimensional projection, it is very small and attractive. In addition, the progress bar has a percentage of progress in the center of the loop, which can be updated in real time according to the progress of the percentage value, compared with the previously shared HTML5 / CSS3 sector progress bar animation has certain advantages.